| Brecknock | |
| Hq: | Brecon |
| Start: | 1894 |
| End: | 1974 |
| Populationfirst: | 9,758 |
| Populationfirstyear: | 1901 |
| Populationlast: | 6,893 |
| Populationlastyear: | 1971 |
| Areafirst: | 189532acres |
| Areafirstyear: | 1901 |
| Arealast: | 189532acres |
| Arealastyear: | 1961 |
Brecknock was a rural district in the administrative county of Breconshire, Wales, from 1894 - 1974. The district surrounded, but did not include, the town of Brecon, which was a separate municipal borough.
In 1974 local government throughout Wales was reorganised. Under the Local Government Act 1972, Brecknock Rural District was abolished and its area was combined with a number of other local government areas to form the Borough of Brecknock, one of three districts of the new county of Powys.
Brecknock Rural District comprised the following civil parishes.[1] They are listed below using the spelling current at the times of the rural district's existence: